ISNT原位切口移位法
isv.是(be的第三人称单数一般现在时)
Is this all right?
Is closed on a page.是否已在网页上关闭的布尔值。
Is it snowing now?
ischmia- reperfusion缺血-再灌注
Is it too big now?
Is he a biologist?
Is anything wrong?
is it ... or not是否
Is that a new car?
Is that seat free?